① The quality advantages of large-scale urea, ammonium phosphate and potassium chloride based fertilizers lay a solid foundation for the mixing method. The rise of ammonium phosphate production process represented by large-scale TVA drum ammoniation unit in the United States provides the market with a large number of low-cost monoammonium phosphate and diammonium phosphate granular fertilizers with good storage and transportation properties Suitable low nitrogen and high phosphorus components and compatibility with other mixed materials provide favorable conditions for the development of mixed fertilizer. At present, the quality of large particle urea and ammonium phosphate in China has met the requirements of mixed fertilizer.
② Mixed fertilizer is a better physicochemical product of balanced fertilization. According to the principle of balanced fertilization, monoammonium phosphate / diammonium phosphate is used to produce multi-element and full nutrient special fertilizer, with total nutrient of more than 50%, flexible formula and strong pertinence. In addition to nitrogen, phosphorus and potassium, medium and trace elements, herbicides and pesticides can also be added according to the law of crop fertilizer demand and the level of soil fertilizer supply. Soil testing and fertilization can make the nutrients in the fertilizer absorbed and utilized by crops to a great extent, so as to reduce the cost of fertilization and the impact on the environment caused by excessive nutrient dispersion or loss.